101955 Bennu (1999 RQ36)

NEO PHA MOID ⇩ IMP ⇩ COV ★ EPH ⇩ OBS ⇩ Radar
Orbital Elements
Epoch (TDB)2025-11-21 (JD 2461000.5)
Eccentricity (e)0.2037021394 ± 1.43e-07
Semi-major axis (a)1.1260024860 AU ± 7.18e-10
Inclination (i)6.03213938° ± 1.73e-05
Long. of Asc. Node (Ω)1.96888645° ± 1.52e-05
Arg. of Perihelion (ω)66.40871114° ± 2.96e-05
Mean Anomaly (M)267.46828697° ± 1.88e-05
Mean Motion (n)0.8249037010°/day ± 7.89e-10
Perihelion dist (q)0.89663337 AU ± 1.61e-07
Aphelion dist (Q)1.35537160 AU ± 1.61e-07
Orbital Period1.19483799 yr ± 1.14e-09
Physical Parameters
H (abs. magnitude)20.21
G (slope)-0.03
Diameter0.484 km
Geometric Albedo0.044
Rotation Period4.296 h
SMASS II TypeB
Orbit Solution
SourceIAA
Solution Date2026-06-08
RMS Residual10.733″
Uncertainty0
Orbit TypeApollo
MOID0.003758 AU
Observations Used603
Radar Obs Used29
Oppositions4
Arc Total1999-2025
First Observation Used1999-09-11
Last Observation Used2025-04-28
Observations (603)
Date Type RA Dec Mag Band Observatory
1999-09-20 01:16:24 C 03 58 43.98 -10 39 38.9 d 046
1999-09-20 02:45:33 C 04 01 09.28 -10 10 56.3 z 859
1999-09-20 03:15:17 C 04 01 50.19 -10 04 27.9 z 859
1999-09-20 03:39:19 C 04 02 22.97 -09 59 12.0 z 859
1999-09-20 03:57:50 C 04 02 48.08 -09 55 07.4 z 859
1999-09-20 04:10:52 C 04 03 05.71 -09 52 13.8 z 859
1999-09-20 04:37:57 C 04 03 42.26 -09 46 12.1 z 859
1999-09-20 05:26:20 C 04 04 47.30 -09 35 18.5 z 859
1999-09-20 06:00:06 C 04 05 32.58 -09 27 37.0 z 859
1999-09-20 06:26:11 C 04 06 07.56 -09 21 37.5 z 859
1999-09-20 07:12:23 C 04 07 09.66 -09 10 53.9 z 859
1999-09-20 07:53:15 C 04 08 04.90 -09 01 17.4 z 859
1999-09-20 23:30:44 C 04 33 13.05 -05 11 41.1 121
1999-09-20 23:32:15 C 04 33 15.48 -05 11 16.4 121
1999-09-20 23:33:37 C 04 33 17.69 -05 10 53.9 121
1999-09-20 23:36:03 C 04 33 21.56 -05 10 14.1 121
1999-09-20 23:59:26 C 04 33 58.93 -05 03 50.9 121
1999-09-21 00:00:37 C 04 34 00.83 -05 03 31.7 121
1999-09-21 00:01:48 C 04 34 02.74 -05 03 11.8 121
1999-09-21 15:48:10 C 05 02 08.76 -00 14 46.2 z 428
1999-09-21 15:49:03 C 05 02 10.32 -00 14 29.7 z 428
1999-09-21 15:49:58 C 05 02 11.94 -00 14 12.5 z 428
1999-09-21 15:50:48 C 05 02 13.37 -00 13 57.4 z 428
1999-09-22 01:29:01 C 05 20 14.74 +02 36 18.3 z 121
1999-09-22 01:30:03 C 05 20 16.61 +02 36 37.9 z 121
1999-09-22 01:57:20 C 05 21 06.70 +02 45 24.4 z 121
1999-09-22 01:58:30 C 05 21 08.85 +02 45 47.0 z 121
1999-09-22 10:17:59 C 05 37 49.87 +05 28 09.6 848
1999-09-22 10:19:04 C 05 37 51.98 +05 28 31.3 848
1999-09-22 10:20:10 C 05 37 54.11 +05 28 53.1 848
1999-09-22 10:21:16 C 05 37 56.21 +05 29 14.5 848
1999-09-22 10:23:25 C 05 38 00.37 +05 29 57.5 848
1999-09-22 10:24:32 C 05 38 02.51 +05 30 19.1 848
1999-09-22 10:25:38 C 05 38 04.60 +05 30 40.8 848
1999-09-22 10:26:44 C 05 38 06.69 +05 31 02.1 848
1999-09-22 10:31:05 C 05 38 15.11 +05 32 28.1 848
1999-09-23 10:57:38 C 06 28 03.94 +13 18 27.2 848
1999-09-23 11:23:31 C 06 28 54.79 +13 26 21.7 848
1999-09-23 11:36:20 C 06 29 19.89 +13 30 16.5 848
1999-09-23 11:43:50 C 06 29 34.54 +13 32 33.4 848
1999-09-23 11:58:17 C 06 30 02.70 +13 36 56.3 848
1999-09-23 12:11:06 C 06 30 27.62 +13 40 49.4 848
1999-09-23 18:20:38 C 06 42 59.45 +15 39 42.6 z 428
1999-09-24 18:32:38 C 07 30 06.14 +21 40 48.0 z 428
1999-12-29 15:39:24 C 13 48 01.88 +05 19 54.3 568
1999-12-29 15:43:49 C 13 48 02.19 +05 19 50.1 568
1999-12-30 15:28:15 C 13 49 50.94 +04 57 29.1 568
1999-12-30 15:31:39 C 13 49 51.19 +04 57 26.0 568
2000-03-30 09:22:01 C 14 23 57.02 -21 26 41.6 695
2000-03-30 09:26:00 C 14 23 56.54 -21 26 43.0 695
Radar Observations (29)
Epoch (UTC)ValueSigmaUnitsFreq (MHz)ReceiverTransmitter
1999-09-21 09:00:00 135959 5 Hz 8560 -14 -14
1999-09-21 10:20:00 15418454 10 us 8560 -14 -14
1999-09-23 09:30:00 14820631 5 us 8560 -14 -14
1999-09-23 09:36:00 14800106.19 1 us 2380 -1 -1
1999-09-23 11:28:00 14846130.16 1 us 2380 -1 -1
1999-09-24 10:26:00 15838961.63 1 us 2380 -1 -1
1999-09-24 12:23:00 15955075.55 1 us 2380 -1 -1
1999-09-25 11:09:00 17634668.28 1 us 2380 -1 -1
1999-09-25 12:55:00 17785960.83 1 us 2380 -1 -1
1999-10-01 13:40:00 35441297 1 us 8560 -14 -14
2005-09-16 08:44:00 47170.7359 1 Hz 2380 -1 -1
2005-09-16 08:45:00 36658796.03 0.5 us 2380 -1 -1
2005-09-16 09:27:00 36609699.09 0.5 us 2380 -1 -1
2005-09-18 12:20:00 33873463 1 us 8560 -14 -14
2005-09-19 12:50:00 33215505.86 1 us 8560 -14 -14
2005-09-20 09:06:00 2631.7168 1 Hz 2380 -1 -1
2005-09-20 09:09:00 33024251.3 0.5 us 2380 -1 -1
2005-09-20 11:24:00 33024222.68 0.5 us 2380 -1 -1
2005-09-28 11:57:00 45550976.4 0.5 us 2380 -1 -1
2005-09-28 12:00:00 -73137.0697 1 Hz 2380 -1 -1
2005-09-28 13:35:00 45734943.4 0.5 us 2380 -1 -1
2005-10-02 12:55:00 57594268.2 0.5 us 2380 -1 -1
2005-10-02 14:10:00 57762582.67 0.5 us 2380 -1 -1
2011-09-27 11:39:00 197293588.79 2 us 2380 -1 -1
2011-09-27 11:39:00 -66400.2088 1 Hz 2380 -1 -1
2011-09-28 11:08:00 199711477.27 2 us 2380 -1 -1
2011-09-28 11:08:00 -68554.7858 1 Hz 2380 -1 -1
2011-09-29 11:55:00 202378520.04 2 us 2380 -1 -1
2011-09-29 11:55:00 -72841.0156 1 Hz 2380 -1 -1
Station codes
-14 DSS-14 Goldstone (70-m) -1 Arecibo (305-m, 1963–2020)